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E.coli or E.coli O157 strain for testing wheat flour


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Solvita

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Posted 06 April 2021 - 05:11 PM

Hi, what should be tested in flour - E.coli or E.coli O157 strain? What is the difference and what is the limit for wheat flour? Br, Solvita:)



Scampi

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Posted 06 April 2021 - 07:56 PM

https://www.cdc.gov/...ntestinal tract.

 

0157 is NOT the only pathogenic strain

https://www.ncbi.nlm...les/PMC6395439/

 

Legal limits will depend on the country(ies) you're selling too


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Charles.C

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Posted 07 April 2021 - 06:50 AM

Hi, what should be tested in flour - E.coli or E.coli O157 strain? What is the difference and what is the limit for wheat flour? Br, Solvita:)

 

So what is the specification ?

 

As per link in Post 2, the species E.coli exhibits a large number of strains.

 

The result of the standard E.coli test procedure estimates a so-called Generic E.coli "group/biotypes" typically referred to textually as "E.coli".  Most strains in this group are typically harmless although their detection in food is utilised as an indicator of fecal contamination/General Hygiene.  However, the Generic group may also include  a few pathogenic strains, eg  E.coli O157, which are usually estimated by alternative procedures.

A more detailed discussion of above is attached -

Attached File  Generic-Pathogenic E.coli.pdf   131.81KB   9 downloads

 

Limits for Generic E.coli vary depending on source. Ideally should be undetected of course. (See example below).

afaik all Pathogenic E.coli strains are classified as zero-tolerant.

 

The enclosed example suggests one possible answer to yr OP query could be Yes/No. Other permutations may occur such as illustrated in 2nd link post 2..

Attached File  flour micro.pdf   87.12KB   10 downloads

 

PS - the above is a slight simplification inasmuch as some locations (eg Canada/USA) have different interpretations of generic E.coli (eg contains only non-pathogenic strains). The details are summarised  in posts 2,8 of the thread linked below however it's a somewhat long and highly twisting Road to navigate.

 

https://www.ifsqn.co...oli/#entry93037


Kind Regards,

 

Charles.C


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